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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98081fda7991e49a7750db6c1e4ce069eace4b06f98e38b48594f4a2b8ad68e5' 
  AND token = '2wqQa5MGAScPy2TIfRhe3Yx+6rckkyFFbs5McsSKjAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}